Friedman S, Liu M, Dörscher-Kim J, Kim S
Department of Endodontics, Hadassah-Hebrew University School of Dental Medicine, Jerusalem, Israel.
Lasers Surg Med. 1991;11(4):325-30. doi: 10.1002/lsm.1900110403.
The effect of CO2 laser irradiation on pulpal microcirculation was studied in cat canines. The enamel surfaces of 4 teeth were exposed with energy densities of 304-1440J/cm2, using either a handpiece or a microslad, with a focal spot of 0.21mm and 0.33mm respectively. Pulpal blood flow (PBF) before and following lasing was recorded through the intact tooth surface by a laser Doppler flowmeter. CO2 laser irradiation caused an increase in PBF, which was immediate and transient. The PBF increase was higher in a large pulp than in a small pulp, and it was inversely related to the focal spot size. These findings confirm that the dental pulp is thermally affected by CO2 lasing of the tooth surface, however, without extensive pulp coagulation. It is concluded that the effects of laser irradiation on the pulpal microcirculation may be studied in situ by means of the presented methodology.
在猫的犬齿上研究了二氧化碳激光照射对牙髓微循环的影响。使用手持器械或微型载片分别以304 - 1440J/cm²的能量密度照射4颗牙齿的釉质表面，光斑大小分别为0.21mm和0.33mm。通过激光多普勒血流仪透过完整的牙齿表面记录激光照射前后的牙髓血流量（PBF）。二氧化碳激光照射导致PBF立即且短暂增加。大牙髓中的PBF增加幅度高于小牙髓，且与光斑大小呈负相关。这些发现证实牙齿表面的二氧化碳激光照射会对牙髓产生热影响，但不会导致广泛的牙髓凝固。结论是可以通过所提出的方法在原位研究激光照射对牙髓微循环的影响。
